Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1989-04-11
1990-06-26
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
303 962, 303100, B60T 832, B60T 1312, B60T 1500, G05D 1300
Patent
active
049366386
ABSTRACT:
An anti-locking control system is provided which is intended for use with a vehicle brake system comprising two actuating circuits disposed in diagonal relationship. While in state-of-the-art brake pressure control systems of the type under consideration, per wheel cylinder, one electromagnetic valve open in de-energized condition and one electromagnetic valve closed in de-energized condition are needed, it is suggested according to the present invention that the open when energized valve of the wheel cylinder of the front axle, in the control mode, performs the brake actuation functions of the matching cylinder, i.e. wheel cylinder, of the same actuation circuit on the rear axle. This is achieved by employment of a pressure-responsive blocking valve blocking the hydraulic conduit leading to the wheel cylinder of the rear axle once a predetermined switch-over pressure is reached, thereby forcing the pressure fluid volume intended for the wheel cylinder of the rear axle, to flow through the open when energized valve of the wheel cylinder of the front axle. This construction reduces the number of electromagnetic valves required in the brake actuation circuit.
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Alfred Teves GmbH
Butler Douglas C.
Seitter Robert P.
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